4 parks in Washington with outdoor water-park areas, from 4 operators. Outdoor and indoor-plus-outdoor water parks. Outdoor areas are seasonal; many close after Labor Day or by early October and publish next season’s dates in spring.
The park lists August 22 as the end of its season without giving a year; that date has passed in 2026. Check the official website for next season's dates. Outdoor summer water park at the Asotin County Family Aquatic Center in Clarkston, Washington, with slides, a lazy river and a wave pool. Daily admission is sold; the park is seasonal.
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View park detailsThe published 2026 season ended September 7, 2026. Check the official calendar for the next season. Seasonal outdoor water park on a hillside above Lake Chelan, WA, sold by day ticket or season pass. The scheduled season runs from Memorial Day weekend to Labor Day.
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View park detailsThe park's published season ends on Labor Day (September 7 in 2026) each year, so its 2026 season is over. Check the official website for next season's dates. City-run outdoor water park in Moses Lake, Washington, open in summer. Every visitor needs a signed digital waiver on the day of entry; day passes, punch cards and season passes are sold.
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View park detailsThe water park closed for the 2026 season after September 7; the theme park stays open for fall events. Outdoor water park inside a combined theme and water park south of Seattle. One admission ticket covers both parks, and the water park runs only in the summer season.
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